Carol Kuhlthau is a renowned professor and researcher known for developing the six-stage Information Search Process model and her groundbreaking work on the cognitive, affective, and physical aspects of information seeking. She has authored several influential books and published widely on topics like uncertainty in the research process, guided inquiry learning, and the role of school libraries in supporting constructivist learning in the 21st century. Kuhlthau's Information Search Process model and emphasis on uncertainty as part of the learning process have profoundly shaped library instruction and information literacy initiatives.